Malicious Office (OLE) / .XLS — malware analysis report

Static analysis result for SHA-256 6bbce57af634b5a5…

MALICIOUS

Office (OLE) / .XLS

71.0 KB Created: 2015-06-05 18:19:34 Authoring application: Microsoft Excel First seen: 2022-06-07
MD5: 8bd8d78133fec1ffa6d80add9c741438 SHA-1: c2c52b2f3a96dbe3e23a03c80f9dbe14734aeedc SHA-256: 6bbce57af634b5a56f4e412c52d987d3c2515089fc82be156c3de564564b25ba
140 Risk Score

Malware Insights

MITRE ATT&CK
T1059.005 Visual Basic T1203 Exploitation for Client Execution

The file contains Excel 4.0 macros, specifically an Auto_Open entry, which is a known technique for executing malicious code. The macros appear to call dangerous formula APIs, including RUN, suggesting an attempt to download and execute a payload from one of the provided URLs. The presence of multiple suspicious URLs further supports this conclusion.

Heuristics 3

  • Excel 4.0 Auto_Open defined name critical OLE_XLM_AUTOOPEN_DEFINEDNAME
    oletools recovered an Auto_Open / Auto_Close entry from an Excel 4.0 macro sheet. The raw BIFF name can be tokenized or partially opaque to byte-string checks, but the recovered macro listing confirms the workbook has an XLM auto-execution entry.
  • XLM Auto_Open with dangerous formula APIs critical OLE_XLM_DANGEROUS_FN
    Excel 4.0 macro sheet contains an Auto_Open / Auto_Close entry and dangerous XLM formula APIs that can invoke programs, write files, or transfer control without VBA.
  • Excel 4.0 (XLM) macro sheet present medium OLE_XLM_AUTOOPEN
    Workbook contains an Excel 4.0 macro sheet sub-stream — XLM is rarely seen in modern legitimate workbooks and was a major Office malware vector during 2020-2022.

Extracted artifacts 1

Files carved from inside the sample during analysis.

FilenameKindSourceSize
xlm_macros.txt
5111faade6798439ce43161a25c95a0c795073df8f05008e90c40cef2fd124d6		 xlm-macro oletools.olevba.extract_all_macros (XLM macro listing) 7798 bytes

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